allow moving ins/wave/samples up or down

src/engine/engine.cpp

@@ -2719,6 +2719,66 @@ void DivEngine::moveOrderDown() {
   isBusy.unlock();
 }
 
+bool DivEngine::moveInsUp(int which) {
+  if (which<1 || which>=(int)song.ins.size()) return false;
+  isBusy.lock();
+  DivInstrument* prev=song.ins[which];
+  song.ins[which]=song.ins[which-1];
+  song.ins[which-1]=prev;
+  isBusy.unlock();
+  return true;
+}
+
+bool DivEngine::moveWaveUp(int which) {
+  if (which<1 || which>=(int)song.wave.size()) return false;
+  isBusy.lock();
+  DivWavetable* prev=song.wave[which];
+  song.wave[which]=song.wave[which-1];
+  song.wave[which-1]=prev;
+  isBusy.unlock();
+  return true;
+}
+
+bool DivEngine::moveSampleUp(int which) {
+  if (which<1 || which>=(int)song.sample.size()) return false;
+  isBusy.lock();
+  DivSample* prev=song.sample[which];
+  song.sample[which]=song.sample[which-1];
+  song.sample[which-1]=prev;
+  isBusy.unlock();
+  return true;
+}
+
+bool DivEngine::moveInsDown(int which) {
+  if (which<0 || which>=((int)song.ins.size())-1) return false;
+  isBusy.lock();
+  DivInstrument* prev=song.ins[which];
+  song.ins[which]=song.ins[which+1];
+  song.ins[which+1]=prev;
+  isBusy.unlock();
+  return true;
+}
+
+bool DivEngine::moveWaveDown(int which) {
+  if (which<0 || which>=((int)song.wave.size())-1) return false;
+  isBusy.lock();
+  DivWavetable* prev=song.wave[which];
+  song.wave[which]=song.wave[which+1];
+  song.wave[which+1]=prev;
+  isBusy.unlock();
+  return true;
+}
+
+bool DivEngine::moveSampleDown(int which) {
+  if (which<0 || which>=((int)song.sample.size())-1) return false;
+  isBusy.lock();
+  DivSample* prev=song.sample[which];
+  song.sample[which]=song.sample[which+1];
+  song.sample[which+1]=prev;
+  isBusy.unlock();
+  return true;
+}
+
 void DivEngine::noteOn(int chan, int ins, int note, int vol) {
   isBusy.lock();
   pendingNotes.push(DivNoteEvent(chan,ins,note,vol,true));

src/engine/engine.h

@@ -349,6 +349,16 @@ class DivEngine {
     // move order down
     void moveOrderDown();
 
+    // move thing up
+    bool moveInsUp(int which);
+    bool moveWaveUp(int which);
+    bool moveSampleUp(int which);
+
+    // move thing down
+    bool moveInsDown(int which);
+    bool moveWaveDown(int which);
+    bool moveSampleDown(int which);
+
     // play note
     void noteOn(int chan, int ins, int note, int vol=-1);
 

src/gui/gui.cpp

@@ -511,11 +511,11 @@ void FurnaceGUI::drawInsList() {
     }
     ImGui::SameLine();
     if (ImGui::ArrowButton("InsUp",ImGuiDir_Up)) {
-      // TODO
+      if (e->moveInsUp(curIns)) curIns--;
     }
     ImGui::SameLine();
     if (ImGui::ArrowButton("InsDown",ImGuiDir_Down)) {
-      // TODO
+      if (e->moveInsDown(curIns)) curIns++;
     }
     ImGui::SameLine();
     if (ImGui::Button(ICON_FA_TIMES "##InsDelete")) {
@@ -582,8 +582,6 @@ const char* ssgEnvTypes[8]={
   "Down Down Down", "Down.", "Down Up Down Up", "Down UP", "Up Up Up", "Up.", "Up Down Up Down", "Up DOWN"
 };
 
-// TODO: BUTTONS TO SELECT BETWEEN 15 AND 31
-// AND DUTY TOO
 void FurnaceGUI::drawInsEdit() {
   if (!insEditOpen) return;
   if (ImGui::Begin("Instrument Editor",&insEditOpen,ImGuiWindowFlags_NoDocking)) {
@@ -1006,11 +1004,11 @@ void FurnaceGUI::drawWaveList() {
     }
     ImGui::SameLine();
     if (ImGui::ArrowButton("WaveUp",ImGuiDir_Up)) {
-      // TODO
+      if (e->moveWaveUp(curWave)) curWave--;
     }
     ImGui::SameLine();
     if (ImGui::ArrowButton("WaveDown",ImGuiDir_Down)) {
-      // TODO
+      if (e->moveWaveDown(curWave)) curWave++;
     }
     ImGui::SameLine();
     if (ImGui::Button(ICON_FA_TIMES "##WaveDelete")) {
@@ -1117,11 +1115,11 @@ void FurnaceGUI::drawSampleList() {
     }
     ImGui::SameLine();
     if (ImGui::ArrowButton("SampleUp",ImGuiDir_Up)) {
-      // TODO
+      if (e->moveSampleUp(curSample)) curSample--;
     }
     ImGui::SameLine();
     if (ImGui::ArrowButton("SampleDown",ImGuiDir_Down)) {
-      // TODO
+      if (e->moveSampleDown(curSample)) curSample++;
     }
     ImGui::SameLine();
     if (ImGui::Button(ICON_FA_TIMES "##SampleDelete")) {